Carbide vs High-Speed Steel (HSS): How to Tell the Difference

Carbide vs High-Speed Steel (HSS): How to Tell the Difference

Updated September 2026

Carbide and high-speed steel (HSS) are both widely used in cutting tools, but they are very different materials. If you have an unmarked router cutter, drill, end mill or other cutting tool, identifying whether it is solid carbide, carbide tipped or HSS is not always as straightforward as it first appears.

At Prima Tooling, we manufacture, sharpen and service cutting tools in solid carbide, tungsten carbide tipped (TCT), HSS and PCD, so material identification is a normal part of working with existing and returned tooling.

There is no single test that will identify every tool with certainty, but a combination of weight, appearance, magnetic response and tool construction will usually give a good indication.

Carbide vs HSS at a Glance

The important point is that none of these characteristics should be considered in isolation.

How to Identify Tungsten Carbide

Most cutting-tool carbide is technically cemented tungsten carbide.

Rather than being a simple piece of pure tungsten carbide, microscopic tungsten carbide grains are held together by a metallic binder, commonly cobalt. Different carbide grades use different grain sizes, binder percentages and additional carbides to produce the required combination of hardness, wear resistance and toughness.

That is why two carbide tools can behave slightly differently when you try to identify them.

One of the easiest first checks is weight.

Carbide Is Noticeably Heavier Than HSS

A solid carbide tool normally feels surprisingly heavy for its size.

Typical cutting-tool cemented carbide grades have a density of roughly 14–15 g/cm³, whereas a commonly used M2 high-speed steel is around 8.1 g/cm³.

This means that two tools of very similar dimensions can have a very noticeable difference in weight.

If you have a known HSS tool of approximately the same diameter and length, simply comparing them by hand can therefore be useful.

However, this test works best for solid carbide tooling.

It does not reliably identify a TCT tool, because a tungsten carbide tipped cutter normally consists of a steel tool body with relatively small pieces of carbide brazed onto the cutting edges.

Is Carbide Magnetic?

This is one of the most common questions about tungsten carbide — and the answer requires a little care.

A magnet can help distinguish HSS from solid carbide, but it should not be treated as a definitive test.

High-speed steel is an iron-based material and will normally show a strong attraction to a magnet.

Cemented tungsten carbide can also exhibit a magnetic response because of the metallic binder phase used within the carbide. The strength of that response can vary according to the carbide grade, binder content and material condition.

So, broadly:

Strong magnetic attraction may suggest HSS or another steel.

Weak or different magnetic behaviour may suggest cemented carbide.

But neither result proves exactly what the material is.

There is another important complication: if you test a TCT cutter, the steel body itself will strongly attract the magnet even though the cutting edges are tungsten carbide.

For this reason, the magnet test should be considered alongside the construction, weight and appearance of the tool.

What Does Carbide Look Like?

Uncoated solid carbide normally has a grey appearance and feels extremely dense and rigid.

Ground carbide surfaces can be smooth and reflective, so colour alone is not a reliable test. Surface coatings can make visual identification even more difficult.

A solid carbide router cutter or end mill will generally have the same material extending from the cutting end through the body and shank.

A carbide-tipped cutter is very different. Look carefully at the cutting edges and you may be able to see the joint where individual carbide tips have been brazed to a steel body.

This distinction is particularly important when identifying woodworking and panel-processing tooling.

Solid Carbide or Carbide Tipped?

The terms solid carbide and carbide tipped are sometimes incorrectly used interchangeably.

A solid carbide tool is manufactured predominantly from a cemented carbide blank. Examples include many CNC router cutters, end mills and drills.

A TCT — tungsten carbide tipped — tool normally has a steel body with separate tungsten carbide cutting edges brazed into position.

Prima Tooling manufactures both types because they suit different applications.

Solid carbide is particularly useful for smaller-diameter cutters where rigidity, precision and wear resistance are important.

TCT construction allows much larger diameter cutters and complex profiles to be produced economically using a robust steel body while still providing carbide cutting edges.

See our Solid Carbide Tooling and TCT Cutting Tools pages for examples of both constructions.

How Can You Tell if a Drill Bit Is Carbide?

Drills can be particularly confusing because several different constructions are available.

A drill may be:

• HSS
• cobalt-alloyed HSS
• solid carbide
• steel-bodied with a carbide tip
• coated, making visual identification even harder

Start by looking closely at the cutting end.

On a carbide-tipped drill, you may be able to see where a separate carbide cutting element has been brazed into the steel body.

A solid carbide drill will normally have a consistent material throughout its cutting section and shank and will feel noticeably heavy relative to an equivalent HSS drill.

A magnet can provide additional evidence, but again it should not be relied upon alone.

If the drill is valuable or is going to be reground, identifying its construction correctly before grinding is important.

For production drilling applications, see our Drilling Tools range.

How Do Carbide and HSS Wear Differently?

The two materials also tend to fail differently.

Carbide offers excellent hardness and abrasive wear resistance but is less tolerant of shock and excessive vibration. A carbide cutting edge can therefore develop small chips or, under severe conditions, fracture.

HSS has greater toughness and can tolerate conditions that might damage a brittle carbide edge. Its cutting edge is more likely to become rounded or worn rather than breaking in the same way.

This is one reason the best cutting-tool material depends on the machine, workpiece material, tool diameter, cutting speed, rigidity and production requirement rather than simply choosing the hardest material available.

Which Is Better: Carbide or HSS?

Neither material is universally better.

Solid carbide is often chosen where high wear resistance, rigidity, dimensional accuracy and longer production runs are required.

HSS remains valuable where toughness, complex tool forms or particular cutting conditions make it the more appropriate choice.

TCT provides another option where the advantages of a steel tool body can be combined with tungsten carbide cutting edges.

For highly abrasive materials and demanding production volumes, PCD — polycrystalline diamond — may offer significantly greater wear resistance again.

The correct choice should therefore be made around the machining application rather than material name alone.

Can Carbide and HSS Tools Be Sharpened?

Yes.

Both carbide and HSS cutting tools can normally be resharpened provided there is sufficient material remaining and the tool has not suffered damage that makes servicing uneconomical or unsafe.

Carbide requires suitable diamond grinding equipment and accurate control of the original cutting geometry.

TCT tooling may also be sharpened and, where technically practical, damaged carbide tips can sometimes be replaced rather than replacing the complete cutter.

Prima Tooling provides cutting tool sharpening, retipping and repair for both standard and bespoke production tooling.

Still Not Sure What Your Cutting Tool Is Made From?

If you have an unmarked cutter and cannot establish whether it is HSS, solid carbide or carbide tipped, you do not necessarily need to identify it yourself.

Send Prima Tooling photographs of the tool, its dimensions and any visible markings, or send the cutter to us for inspection.

We manufacture and service cutting tools at our facility in Essex and can advise on the existing tool construction, sharpening possibilities and suitable replacement tooling where required.